The number of crimes that occurred in a certain city per 1000 people had decreased from in 1920 to in . Find the average rate of change in the number of crimes per 1000 people that occurred from 1920 to 1980.
To find the average rate of change in the number of crimes per 1000 people that occurred from 1920 to 1980, we need to calculate the difference in the number of crimes per 1000 people between those two years and divide it by the number of years.
First, let's label the number of crimes per 1000 people in 1920 as C1 and in 1980 as C2. According to the question, the number of crimes per 1000 people in 1920 is not specified, and the number of crimes per 1000 people in 1980 is also not specified.
To calculate the average rate of change in the number of crimes per 1000 people, we need to find the difference in C2 and C1 and divide it by the number of years (1980 - 1920 = 60 years).
So the formula to calculate the average rate of change is:
Average rate of change = (C2 - C1) / (1980 - 1920)
However, as the values of C1 and C2 are missing, we do not have enough information to calculate the average rate of change in this case.